Pump



PUMP

Filed Aug. 18, 1927 W. I. DERRICK April 10, 1928.

m a M 2 .4 vlw mu I ATTORNEYS Patented Apr. '10, 1928.

UNITED- STATES PATENT. OFFICE- WILLTAM I. DERRICK, OF DAVENPORT, IOWA, ASSIGNOR TO WESTCO-CHIPPEWA PUMP COMPANY, OF DAVENPORT, IOWA, A CORPORATION OF DELAWARE.

PUMP.

Application filed August 18, 1927. Serial No. 213,812.

This invention relates to rotary pumps of the type disclosed in the patent to Wahle, Re-issue No. 16,704, issued on May 19, 1925, in which suction is created at the inlet and pressure at the outlet of the pump by the impelling action of the vanes on the peripheral portion of a rotor, positioned alongside an unobstructed channel extending along the peripheral portion of the rotor from the inlet to the outlet.

The main objects of the present invention are to provide a rotary pump of the charac 'ter above referred to which is simple in design and which may be manufactured at low cost and to provide a pump in which there is little decrease in eficiency due to frictional resistance to the turning movement of the rotor and to the flow of water through the pump.

Other objects of the present invention are to provide a pump of the character described in which the vanes are formed in the rotor intermediate the center and circumference thereof, and to provide a pump in which the rotor has side. faces which have a close running fit, each in a single plane with opposite sides of the casing to provide an efi'ective seal at the sides of the water chan nel to confine the water to the channel and between the inlet and outlet to prevent back flow from the outlet to the inlet.

With the above and other objects in view, the invention may be said to comprise the pump as illustrated in the accompanying drawings hereinafter described and particularly set forth in the appended claims, together with such variations and modifications thereof as will be apparent to one skilled in the art to which the inventionap pertains.

I Reference should be had to the accompanying drawings forming a part of this specification in which:

Fig. l is a side elevation of a pump embodying the invention, a portion of the easing being broken away to show the rotor and the casing inlet and outlet.

Fig. 2 is a sectional elevation of the pump looking from the left toward the pump as positioned in Fig. 1, the lower portion of the view showing the casing and rotor in radial section.

Fig. 3 is .a view similar to Fig. 2-showing a modified form of the invention.

Fig. 4 is a view similar to Fig. 2, showing a further modification of the invention.

As shown in Figs. 1 and 2, casing is formed of two half sections 1 and 2 joined along the central plane of the casing, the two sections being provided with marginal flanges 3 which are secured together by bolts 4. The casing is provided with a peripheral inlet 5 and a peripheral outlet 6 which are relatively close together, and centrally of the casing there is a transverse shaft 7 which passes through glands 8 in the opposite walls of the casing. Fixed to the shaft 7 is a rotor 9 in the form of a fiat disc which has a close running fit within the casing. The rotor disc 9 is provided'with an annular row of closely spaced radially elongated openings 10 extending transversely through the disc and forming betweenthem impeller vanes 11. Each of the sections 1 and 2 of the casing is provided upon its inner side with a channel 12 and these channels extend throughout the major portion of the circumference of the casing alongside the annular row of openings in the rotor 9. At the inlet and at the outlet the channels 12 extend past the periphery of the rotor to form the inlet and outlet passages. The rotor 9 has a continuous peripheral portion 13 outside the annular row of openings 10 and a continuous inner portion 14 within the annular row of openings.

The casing members 1 and 2 are formed to have flat faces inwardly and outwardly of the channels 12, which lie in close proximity to the portions 13 and 14 of the rotor to prevent leakage of water, the central portions of the inner faces of sections 1 and 2 being slightly recessed to provide spaces 15 upon opposite sides of the rotor. The portions of the inner faces of the sections 1 and 2 of the casing extending between the ends of the channels 12 and lying between the inletand outlet arein the planes'of the portions of the inner faces which lie in close proximity to the disc upon opposite sides of the channels 12 so that there can be no flow of water from the outlet back tothe inlet, the space between the ends of the channels being sufficient to cover a plurality of openings in the disc. The channels 12 through which the water.flows from the inlet to the outlet are preferably of gradually decreasing cross sectional area from. the inlet to the outlet to compensate for the increase in speed of movement of the stream of liquid flowing from the inlet to the outlet. It should also be noted that the frictional resistance to flow of water through the pump casing is I small due to the fact that a large proportion Shoulder 25 of the wall surface of the passage is formed by the rotor.

Water entering through the inlet 5 passes into the channels 12 extending along-opposite sides of the rotor and is impelled toward the outlet by the action of the vanes 11 when the rotor is turning. Since the casing has close fit with opposite sides of the rotor between the inlet and outlet, the only water that can pass from the outlet to the inlet is that carried in the openings of the rotor so that the pressure at the outlet cannot be transmitted back to the inlet.

In Fig. 3 of the drawing, there is shown a slight modification ofthe invention in which the rotor 16 has a central portion 17 of somewhat less thickness than the peripheral portion and is provided in the peripheral portion with transverse apertures 18, corresponding with the apertures 10 above described. The rotor 16 has a continuous portion 19 outside the annular row of apertures and a continuous portion 20 'inside the row of apertures. The casing consists of a section 21 which has a flat inner face,.and a section 22 which has a marginal flange 23 bolted to the section 21,- a cylindrical portion 24 which receives the continuous peripheral portion 19 of the rotor, and a which closely overlies the peripheral portion 19 of the rotor on the side opposite that adjacent the inner face of the section 21, and a channel 26 which extends circumferentially alongside the row .of apertures in the rotor. The inlet 27 and outlet 28 are carried by the section 22 of the casing and communicate with theopposite ends of the channel 26. The casing members 21 and 22 have flat inner faces which closely overlie'the opposite faces of the rotor 16, outwardly and inwardly of the annular row of openings 18, so that the flow of water between the inlet and outlet is confined to the channel 26 and an effective ieal is providedbetween the inlet and out- In Fig. l of the drawings there is shown a further modification in which casing sections 29 and 30 are formed in substantially the same 'way as the corresponding casing sections 21 and 22, as in the modification shown in Fig. 3, channel 31 in a casing section 30 extending from the inlet to the outlet in substantially the same manner as the channel 26 above described and the flat innor faces of the sections 29 and 30 lie in close proximity in the opposite faces of the rotor to confine the water to its channel. The rotor shown in Fig. 4 is provided with the form 'of a provided menses ing section 29 is provided with an internal PIOjQCtlOlI- 33 between the inlet and out-let which fits within the channel in the adjacent face of the rotor to obstruct the channel be tween the inlet and outlet and provide a seal which prevents back flow from the outlet to the inlet.

In each of the modifications above described, the rotor is in the form of a substantially flat disc and the impeller vanes are provided by means of an annular row of apertures through the disc inwardly of 1ts periphery. It will be apparent, therefore, that both the rotor and casing are of simple and compact design, that ver little machining is required and the cost of manufacture is low.' A further advantage of the openings through the disc is that lateral thrusts on the rotor tending to shift the same toward one side or the other of the casing are eliminated.

Furthermore, by providing a channel in the casing wall which extends only from the inlet to the outlet, the flat inner face of the 3 wall betwe'en'the inlet and outlet which lies closely adjacent the face of the rotor serves to prevent back flow from the outlet to the dure can be made without departing from inlet making it unnecessary to provide spemy invention as defined in the appended I claims.

What I claim is:

1. A rotary pump comprising a rotor in disc having an annular row of transverse apertures therein, and a casing with an inlet and an outlet and having walls closely overlying the face of the disc inwardly and outwardly of said row of apertures and between the inlet and outlet, said casing and disc forming an unobstructed passage'alongside the row of apertures from the inlet to the outlet.

2. A rotary pump comprising a rotor in the form of a disc having an annular row of transverse apertures therein, and a casin provided with an inlet and an outlet and having walls closely overlying the face of the disc inwardly and outwardly of said row of apertures and between the inlet and outlet, said casing having a'channel extending alongside said row of apertures and forming a continuous unobstructed passage from the inlet to the outlet.

3. A rotary pump comprising a rotor in the form of a disc having an annular row of closely spaced radially elongated trans verse apertures therein, and a .casing provided with an inlet and an out-let and having walls closely overlying the face of the disc inwardly and outwardly of said row of apertures and between the inlet and outlet, said casing and disc forming an unobstructed passage alongside the row of apertures from the inlet to the outlet.

4. A rotary pump comprising a rotor in the form of a disc having transverse apertures closely spaced throughout its circumference, said apertures being elongated and extending inwardly from adjacent the circumference of the disc, a casing having a peripheral inlet and a peripheral outlet adjacent the inlet and having side walls closely overlying the opposite side faces of the apertured portion of the disc, one of said walls having a channel extending circumferentially alongside the apertured portion of the disc from the inlet to the outlet, said Side wall lying closely adjacent the face of the disc on opposite sides of thechannel and said inlet and outlet being spaced apart circumferentially a distance sufiicient to accommodate a plurality of rotor apertures between the closely overlying walls between the apertures.

5. A rotary pump comprising a rotor in the form of a disc having an annular channel in-a face thereof adjacent its periphery and closely spaced transverse apertures through the disc and opening into the channel, and a casing having side walls closely wardly and outwardly of the channel and apertures, said casing having-an inlet and an outlet and a circumferential channel in a side wall extending alongside said apertures from the inlet to the outlet, said casing having a portion between the inlet and outlet closely overlying the apertured portion of the disc on one side and the wall of the casing on the other side overlying the channel in the rotor and having a portion extending into the channel of the rotor and closely overlying the bottom of the rotor channel.

6. A rotary pump comprising a rotor in the form of a disc having apertures extending transversely therethrough and closely spaced throughout the circumference of the disc, a casing having an inlet and an outlet and a channel opening to the apertured portion of the disc,sai-d channel extending circumferentially along a face of the disc from the inlet to the outlet, the side walls of said casing closely overlying the opposite faces of the apertured portion of the disc at all points except along the open slde of said channel. I

7 A rotary pump comprising a rotor in the form of a disc having an annular row of apertures extending transversely therethrough, and a casing having an inlet and an outlet and having walls making a close running fit with the apertured portlon of both sides of the disc between the outlet and inlet and making a close running fit with opposite faces of the disc both inwardly and outwardly of said row of apertures, said casing and rotor defining therebetween a pair of spaced unobstructed channels into which the opposite ends of the apertures open, the peripheral portion of said disc maklng a close running fit with the caslng throughout its circumference.

In testimony whereof I aflix my signature.

WILLIAM I. DERRICK. 

